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Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers

Fly ash (FA) and exhausted bed sands (sands wastes) that are generated in biomass burners for energy production are two of the wastes generated in the pulp and paper industry. The worldwide production of FA biomass is estimated at 10 million tons/year and is expected to increase. In this context, th...

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Autores principales: Vilarinho, Inês Silveirinha, Capela, Marinélia Neto, Pinho, Ana Sofia, Labrincha, João António, Seabra, Maria Paula
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9612157/
https://www.ncbi.nlm.nih.gov/pubmed/36296476
http://dx.doi.org/10.3390/molecules27206881
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author Vilarinho, Inês Silveirinha
Capela, Marinélia Neto
Pinho, Ana Sofia
Labrincha, João António
Seabra, Maria Paula
author_facet Vilarinho, Inês Silveirinha
Capela, Marinélia Neto
Pinho, Ana Sofia
Labrincha, João António
Seabra, Maria Paula
author_sort Vilarinho, Inês Silveirinha
collection PubMed
description Fly ash (FA) and exhausted bed sands (sands wastes) that are generated in biomass burners for energy production are two of the wastes generated in the pulp and paper industry. The worldwide production of FA biomass is estimated at 10 million tons/year and is expected to increase. In this context, the present work aims to develop one-part alkali-activated materials with biomass FA (0–100 wt.% of the binder) and sands wastes (100 wt.% of the aggregate). FA from two different boilers, CA and CT, was characterized and the mortar’s properties, in the fresh and hardened conditions, were evaluated. Overall, the incorporation of FA decreases the compressive strength of the specimens. However, values higher than 30 MPa are reached with 50 wt.% of FA incorporation. For CA and CT, the compressive strength of mortars with 28 days of curing was 59.2 MPa (0 wt.%), 56.9 and 57.0 MPa (25 wt.%), 34.9 and 46.8 MPa (50 wt.%), 20.5 and 13.5 MPa (75 wt.%), and 9.2 and 0.2 MPa (100 wt.%), respectively. The other evaluated characteristics (density, water absorption, leached components and freeze–thaw resistance) showed no significant differences, except for the specimen with 100 wt.% of CA. Therefore, this work proved that one-part geopolymeric materials with up to 90 wt.% of pulp and paper industrial residues (FA and sand) can be produced, thus reducing the carbon footprint associated with the construction sector.
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spelling pubmed-96121572022-10-28 Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers Vilarinho, Inês Silveirinha Capela, Marinélia Neto Pinho, Ana Sofia Labrincha, João António Seabra, Maria Paula Molecules Article Fly ash (FA) and exhausted bed sands (sands wastes) that are generated in biomass burners for energy production are two of the wastes generated in the pulp and paper industry. The worldwide production of FA biomass is estimated at 10 million tons/year and is expected to increase. In this context, the present work aims to develop one-part alkali-activated materials with biomass FA (0–100 wt.% of the binder) and sands wastes (100 wt.% of the aggregate). FA from two different boilers, CA and CT, was characterized and the mortar’s properties, in the fresh and hardened conditions, were evaluated. Overall, the incorporation of FA decreases the compressive strength of the specimens. However, values higher than 30 MPa are reached with 50 wt.% of FA incorporation. For CA and CT, the compressive strength of mortars with 28 days of curing was 59.2 MPa (0 wt.%), 56.9 and 57.0 MPa (25 wt.%), 34.9 and 46.8 MPa (50 wt.%), 20.5 and 13.5 MPa (75 wt.%), and 9.2 and 0.2 MPa (100 wt.%), respectively. The other evaluated characteristics (density, water absorption, leached components and freeze–thaw resistance) showed no significant differences, except for the specimen with 100 wt.% of CA. Therefore, this work proved that one-part geopolymeric materials with up to 90 wt.% of pulp and paper industrial residues (FA and sand) can be produced, thus reducing the carbon footprint associated with the construction sector. MDPI 2022-10-14 /pmc/articles/PMC9612157/ /pubmed/36296476 http://dx.doi.org/10.3390/molecules27206881 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Vilarinho, Inês Silveirinha
Capela, Marinélia Neto
Pinho, Ana Sofia
Labrincha, João António
Seabra, Maria Paula
Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title_full Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title_fullStr Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title_full_unstemmed Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title_short Valorization of Fly Ashes and Sands Wastes from Biomass Boilers in One-Part Geopolymers
title_sort valorization of fly ashes and sands wastes from biomass boilers in one-part geopolymers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9612157/
https://www.ncbi.nlm.nih.gov/pubmed/36296476
http://dx.doi.org/10.3390/molecules27206881
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